The ten shilling coin was a subdivision of the pre-decimal Irish pound

Irish pound

The Irish pound was the currency of Ireland until 2002. Its ISO 4217 code was IEP, and the usual notation was the prefix £...

, worth ½ of a pound, the highest value coin in the pre-decimal system.

The coin was 83.5% silver and 16.5% copper. It measured 1.2 inches (30.5 mm) in diameter and weighed 18.144 gram

Gram

The gram is a metric system unit of mass....

s. The coin did not prove popular, and 1,270,000 of the two million produced were withdrawn and melted down. This unpopularity may be due to the ten shilling Series A Banknote which was then in circulation.